Favorite castle type for castle spamming?

[Norfleet]

As the canonical castle spammer, I favor the watchtower, due to its low cost in gold, time, and points. Admin rating is somewhat secondary when your intent is to plug every single province on the map with them, rendering annoyances like Ghost Riders ineffective against you.

Furthermore, the defensive layout of the Watchtower is top notch: No bothersome walls to impede the exit of your forces, since they're obviously too stupid to stand in the gate and not move.

[tinkthank]

I dont spam, but I like lots of forts with some nations. And for many of these, I like one you didnt mention: The Mausoleum. A bargain on points, admin, cost, and time, sucking only in defense. But those measly 25 pts of defense WILL stop those 1-turn attacks and give you at least 1 turn to move in and repel those stormers.